I've always believed that being able to speak more than one language is beneficial in many ways.
Like being able to communicate with a wider audience, and gaining a better understanding of different cultures. And it's been my experience that learning a second language makes it easier to learn a third.
And now, it appears that being fully bilingual is good for the health. benefits. A study done in Canada found that using more than one language every day for most of one's life could delay the start of dementia by up to four years. Apparently, this protective effect can be attributed to the fact that speaking two languages engages parts of the brain that need constant exercise to stay robust and fight off dementia. There is no known cure for this illness.
You can read more about this research here.